table td,
table th {
	border:1px solid black;
	padding:2px;
}


.slot {
	border:2px solid black;
	padding:2px;
	width:50px;
	height:50px;
	float:left;
}

.optional {
	border:2px solid gray;
}

.busy {
	background-color:#e0e0ff;
}


